Dental tool.



APPLIOATION I'ILED JUNE 13, 1905.

"Philadelphia, in the i cHARLEs P. FRITZ, 'oF' PHLADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE s. WIHITE DENTAL MANUFACTURING COMPANY, O PHILA-` DELPHIA, PENNSYLYANIA,

,DENTAL TOOL.

No. &15,153.

Specific'ation of Letters Patents.

Patented. March 13, 1906.

Application filed June 13, 1905. SerialNo. 264899.

Ta aZZ whom; it may 00711067711:

Be it known that I, CHARLES P. Fn-r'rz, of State of Pennsylvania, have invented certain new and useful Im- 'provements in Dental-Tool Handles, whereof the followin is a specification, reference being had to t 'e accom anying drawings.

My invention may be advantageously ernployed in handles arranged to removably hold dental tools; such as eXcavators,sc-a-lers, probes, and the like, thread on its shank for e'ngagement with a screw-thread in the handle.

`'Tools having characteristics essential to their employment in handles embodyin g the present invention are claimed my application for Letters Patent. of the United States, Serial No. 265,000, filed June 13, 1905,

Heretofore such instruments have been so arranged that it is, necessary to rotate the tool in the handle in'order to 'en-gage and disengage it, and particularly with 'tools comprising blades or points ext-ending transverselywith respect to the axis oi* the screwthreaded shank it has been necessary -to forcibly set the tool 'in engaged position in order to prevent its accidental -disengagement under the Stress to which it is subjected during use. Consequently,it is d'rflicult to'rernove tools from handles thus set, and they are frequently damaged by efiorts to disengage them.

It is the object of my invention to provide a handle of the ola-ss specified wher-ein a tool provided with -a screw-threaded shank may be engagedwithout relative rotation of the tool and handle, such relative rotation being, in fact, prevented at all times during the engag'ement of the tool in the handle by means distinct from the screw-threaded connection.

As hereinafter described, the means preventing rotation of the tool in the handle comprises a key eXtending radially inward from` the tool-socket in the handle in engagement with a' corresponding keyway'in the toolshank, the tool being drawn into position in the handle and discharged therefrom by rotation of a nut within the handle, the rotation of the nut being effected independently of the eX- terior casing of the handle in which the key aforesaid is mounted by a knurled head eX- terior to said casing.

My nventon comprses the varous novel i sectional View of said each having a screw-V whichthey have been ,features of eonstruction and arrangement hereinafter more definitely specified.

In the drawings, Figure I is an elevation of an instrument conveniently embodying my improvements. .view of said instrument, taken on the line II H in Fig. I. F-ig. III is a transverse sectional View of said instrument, taken on the line III HI in Figs. I and IL Fig. IV isa transverse instrument, taken on the line IV IV in Figsl I and II.

In said figures, 1 is the exterior casng, conveniently formed of a tube of hard rubber, conveniently having an exterior 'polygonal Fig. II is a vertical sectional i configuration, -as indicated in Fig. II. Said -casing is provided -at its opposite ends With the metal bushings 2 and 3, which may be roughened or provided with barbed projections 4 on their exterior surfaces, so as to remain stationary in the casing 1 when forced 'into the position shown in Fig. II.

The bushing 2 is provided with the shoulxder '5, -eXtending flush with the eXterior 'surfaces of the casng 1, and saidbushing coms prises a tool-socket 6, terminating in the con- `ical shoulder 7. The key 8 extends radially insa'i'd socket -6, as indicated in Figs. II and -IV, and is .Secured in said bushing 2 by any .convenient means, such as a screw-thread or solder. Said bushing 2 comprises the cylindrical bearing 9 for the -rotary spindle 10, which is adjacent to the tool-socket. The bushing 3 :is provided the cylindrical bearing 14 for said spindle, and the-end of the latter projecting eXterior to said bushing 3 is providedwith the knurled head 15, which may be soldered, riveted, or otherwise permanently secured thereon. Said head 15 is provided with-the annular flange- 17, which is pressed into engagement with the corresponding circumferential groove 18 in the end of the bushing 3, so as to prevent relative longitudinal movement of said spindle and bushing, and

said head 15 comprises the flange 19, extendi'ng flush with the exterior surface of said casin 1.

l`he handle above described is adapted to receive a tool 20, having its shoulder 21 fitted to the shoulder 7 inthe tool-socket 6 and having 'its shank 22 provided with the screwthread 23, fitted to the screw-thread in the nut 12 of the spindle 10. Said tool-shank 22' provided with the nut 12 at its end IOO blade or point 27 or may be of any other dedles may be employed.

also eomprses the keyway25, extendng par- I allel With the aXis of its screw-thread and arranged to engage the key 8, Whioh preventsthe rotation of the tool in the sooket independently of the soreW-threaded connection. Sad tool 20 may have a laterally-extencling sired oonfiguration.

Although I have illustrated a handle h'aving its eXteror oasing formed of hard rubber having a polygonal oonfiguraton uniform throughout its length, it is to be understood that other material and other shapes oi' han- I claim- 1. In a tool-handle, the oombnaton With an eXterior oasing provided With a tool-socket at one end; of a key eXtending radially in said tool-socket; a nut in said easing in registry with said tool-socket; and, a head exterior to said casing Whereby said nut may be rotated, substantially as set forth.

2. In a tool-handle, the combination With an eXterior tubular casing; of bushings secured in the opposte ends of said casing; a tool-soeket in one of said bushings; a key eX- tending radially in said tool-sooket; a spindle arranged to rotate in said oasing, having a nut in registry With said tool-sooket a head on said spindle, eXterior to said cas'mg, arranged to rotate said nut; and, an annular fiange on said head, engaging a oorresponding groove in the eontiguous bushing, arranged to prevent relative longitudinal movement of said spindle and casing, substantially as set forth.

3. In a tool handle, the combination With an exterior tubular oasing; of bushings in the opposite ends of said oasng; a tool-sooket in one of said bushings comprising a oonieal shoulder at the end thereof; a key extending radially in said tool-sooket a spindle arranged to rotate in said oasing, in said bushings, having a nut in registry With said toolsocket and, a head on said spindle, eXterior to said oasing, arranged to rotate said nut,

substantially as set forth.

4. In a tool-handle, the Gomhination with an eXteri r oasing oomprisng a tube of resilient material; of bushings in the opposite ends of said tube, oomprising projeotions arranged to secure said tube and bushings in relatively stationary relation; a tool-soeket in one of said bushings; and, means extending through the other of said bushings arranged-to engage a tool in said sooket, substantially as set forth.

5. In a tool-handle, the oombination with. an eXterior oasing, oomprising a tube of hard rubber, and bushings in the opposite ends thereof; of a tool-sooket in one of said bushings; a key extending radially in said toolsoeket; a spindle arranged to rotate in said oasing, having a nut in registry With said toolsocket; a head on said spindle, eXterior to said oasing, arranged to rotate said nut; and, an annular flange on said head engaging a corresponding groove in the oontiguous bushing, arranged to prevent relative longitudinal movement of said spindle and easing, substantially as set forth.

6. In a tool-handle, the oombination With an eXterior oasing com rising a tube of hard rubber and metal bushings in the opposite ends thereof; of barbed projeotions on said bushings, seourng them in stationary relaton in said tube; a tool-sooket in one of said bushings; a key extending radially in said tool-socket; a spindle arranged to rotate in said oasing, in said bushings, having a nut in registry With said tool soeket; a head on said spindle, exterior to said oasing, arranged to rotate said nut; and, an annular fiange on said head engagng a corresponding groove in the oontiguous bushing, arranged to prevent relative longitudinal movement of said spindle and oasing, substantially as set forth.

In Witness Whereof I have hereunto signed my name, at Philadelphia, Pennsylvania, this Sth day of' June, 1905.

CHARLES P. FRITZ.

Wtnesses:

ARTHUR E. PAIGE, CLIFTON C. HALLOWELL 

